Movies and animations

Petite Princess Yucie

Petite Princess Yucie is an Japanese anime TV series, which
follows the adventures of country-girl Yucie as she is admitted by
chance to the prestigious Princess Academy, where the daughters of
royalty and nobles attend to learn magic, dance, etiquette, defense,
art and music. There, she experiences many things in her quest to
collect the "fragments" of the Eternal Tiara in hopes
that she may become the legendary Platinum Princess, who is
chosen every 1,000 years.

In episode 12 "Challenge! Heaven Triathlon",
searching Crystal Flowers,
she and other challengers go to Heaven and see flying city Tenkai, which
architecture contradict gravity laws.
Below, you can see screenshots from the episode.